Mining machine



Oct. .9 )$23.

M. P. HOLMES MINING MACHINE 2 Sheets-Sheet 1 Original Filed March 28. 1918 JIJIJI .1

vvOct. 9 1923.

original Filed March 2e. 191e M.P.HOLME$ MINING MACHINE 2 Sheets-Sheet 2 sa "y l 6a 70 Ja' 67 1 f7 O l a? 40 45 '34W one W 69 Jai i l as g 32 aa hr i i x fo a7 i /f i il1 J/ 4a i 27 2, 1 il J4 i Y .ro l 1 l' 7d ff ll W y i? i 4/ l 4j' ff l 4,4 El 1 1 f e i 47 i /g Patented Oct. 9. 1923.

UNITED STATES PATENT OFFICE.

MORRIS P. HOLMES. OF ULAREMONI. NFV HAMPSHIRE. ASSIGNOR T0 SULLIVAN` MACHINERY CUMPAN Y.

0F MASSACHUSETTS.

MINING MACHINE.

Application filed March 28. HI8, Sfi'fi' No 225.3452. Rmifwcd April 14, 1922. Serial No. 552,593.

illy

www on illu vinile-lios im' mmh-Illing the lwliiifg Epwml.

ille ln'vp'oing unil cillin-i' :elijml of ihr inwni ion, my ifilwr Willi nnfziiw nin-Voli); ilu? nlmrimnxf lire mil'ieel mln ellvr. will busi. be iainlvhioml from illil following ilismiiilfion nl' mio loi-iii .i' olllimliiiivnl ilzll'ool- Show!! lim iillsiwws ol' illlislrrililin in llw aifiom pziiaying iliziwii'igjs.

Fig. is :i plan View, 1mi-ily lnokun away, nl' tlm vonxplelo mzli'liim.

Fig. if iE :l l'lzigmvnlui-y plan viiw of ille vonlrolling ilvviiPH.

Fig, il is :i similar 'fion' Ellowing lili@ 00niollingv elivii-is in nnollni poEiiion.

l"i; .7 is u viow similar lo Fig. i. :nil 3, Showing ille' (-oniiollin;r ilciiuos: in Still :in-` Ullili yuwiliim.

Fig'. l i :1 Yei'fii'nl `wtion slllisiainliully on lilo lino (l- 1L Fig. l.

Tlw im'vniion is. lwl'oin illixsli'ziiml :1S oinlmlliwl in :1 mining' nim-Inni ol' i110 familiar mom :mil pillan typo, will nizwliine. :1s is usual in nmvliiiimL ol' iliif vpl. i'oxllpiising :1 laoili l'i'oiai ilw l'ol'nzlr'il mul nli wliicll proji'rlr: Iiwil Halimi imi' lll i'iiii'ying :l millor (-lmin ll plm'iiloil willi mailmliis 1Q. Tlio imlvliinc lmily vonlpiisis :i Inolor vnsing 13 :xml :l gwn' or irnnamission casing 14. sniil (fusing l-l. [oggollni' with siiilillulv linniiwork lf {lion-in. providing tlw nwfosszillv liu'ings. j fiiiills. amil snppmin for tlw vni'iolw limb nl' [liv feeding nisi'lmnisni. 0X- copl :in lia-i'viliflor poinlml mit. \Viiliintl1- moins mining lll is :in olvili'ii' or other :Hofm- 16 ol the llsilxll i'viil'silllv typo nliiili o|wialos. Iln'ong'litransmission xnwllzinisin lim-oinuftor dvscrilwil, lo :winnie (liv vntvi clinin nml lli@ fooiling moans for` tlm appar-Mns; Suid ivmlingnivnns including: :i fowl vilain lT secured al its ends to VEnitiililil jacks or otvlicr scouring ilvi'icoS (lioi Elimvn) :il opposzilo omlg of Vllnpolli of train-l of the; mmf-hina. saiil chain passing mw' al guide roller o1' spx-mkv( 1S :il tlm wur oi' the nnu'liinv. a fowl sprocket 19 within tlmx fusing 14. :intl guido rollis or sprockets 20 and 21 @it the side 0f the machine adjacent' the rear and from 8l) lib '.m 'la Bla-Mis ends thereof, respectively. The pa.'.s thus far referred to. as to their general organization, arrangement, and function, are well known in the art and, except as hereinafter pointed out, require no Afurther description 1n detail.

The shaft 22 of the motor 16 has fast thereon a beveled ear 23 which meshes with ay beveled gear 24 ast on a vertical shaft 25 suitably journaled in the framework. Fast on the shaft 25 is a pinion 26 which meshes with a gear 27 keyed or otherwise secured to a second shaft 28 suitably journaled in the framework. The gear 27 is formed with a. hub 29 on which is mounted a sprocket 30 for driving the cutter chain 11,said sprocket being adapted to be clutched to said hub by means of a suitable clutch mechanism indicated bythe numeral 31. Such clutch mechanism, being usual in machines of this ty e, is not illustrated in detail herein.

f osely mounted on the shaft 28 is a clutch member 32 having an internal clutch face engaged by friction clutch members or shoes 3 connected by toggle links 34 with a clutch operating memberV 35 having a splined connection with't-he shaftQB. Movement of the member 35 toward the member 32 causes the toggle links 34 to force the shoes youtwardtv against the clutch face of the member 32, thereby frictionall connecting said member to the shaft 2S. pi'he memher 35 is normally pressed toward the clutch member 32 by means of a spring 36 bearing at one end against an interior shoulder`on the member 35 and at its opposite end against a nut 37 on the threaded end of the shaft 28, whereb the tension of said spring may be adjuster. In the operation of the friction device last described, the member 32 is caused normally t/o rotate with the shaft 28 and thus transmit the feed, but is permitted to yield or slip on said' shaft should an unusual resistance be encountered. The resistance opposed by said device against such yielding or slipping is determined by the force with which the member 35 is pressed toward the member 82 by the spring 36 or by said spring supplemented by other means hereinafter referred to.

.clutch face on the gear 39. The sleeve 41 is formed with a toothed portion constituting a pinion 43 which meshes with a gear 44 fast on the hub of the feed sprocket 19, which sprocket is rotatably mounted on an upright shaft 45 suitably fixed in the framework.

By the connections above described the feed sprocket 19 is rotated to produce a. relatively fast feed. In order to provide for a relatively slower feeding Speed, the following transmission mechanism, operative alternatively with a 'portion of the mechanism last described, is provided:

The hub 4T of the gear 39 is formed with a pinion portion 48 which meshes with a gear 49 rotatably mounted on a stud shaft. 50 suitably supported in the machine frame. The gear 49 has a pinion ortion 51 which meshes with a gear 52 ast on a sleeve 54 rotatably mounted on an upright shaft 53 also fixed in the machine frame. The sleeve 54 has fast thereon a pinion 55 which meshes with a gear 56 rotatably mounted on the shaft 40.

The sleeve 41 is provided on its end op-` posite the clutch face 42 with a second clutch face 57 adapted to engage a cooperating clutch face on the gear 56. By moving the sleeve 41 longitudinally to cause one or the other of the clutch faces 42 or 57 to engage the eooperatin clutch face on the gear 39 or the gear 5G, t e pinion 43 on said sleeve. which pinion drives the feed sprocket i9 through the gear 44, may be rotated either at fast speed directly by the gear 39 or at slow speed from said gear 39 through the gearing 48, 49, 51, 52, 55, and 5o'.

ln order that said clutch sleeve 41 may he conveniently shifted. said sleeve is formed with a. circinnfcrcntial groove which is engaged by a clutch fork 58 formed on a lever 59 pivoted at ti() to the framework. The lever 59 is provided with a slot which receives in a well known manner an eccentric pin or stud 61 on the end of a shaft G2 jonrnaled in the framework and provided at its opposite end with a beveled gear 63 which meshes with u gear segment (i4 on a hand lever G5 rotatably mounted on a stud ti projecting from the framework. By turning the lever 65 into the position shown in Fig. 1. the clutch fork 58 is operated to engage the clutch face 42 on the sleeve 4l with the gear 39, thereby connecting the parts to produce the fast feed. By movirifv the lever 65 into the position shown in ligs. 3 and 5, the clutch fork 58 is moved to engage the clutch face 5T with the gear 56, thereby connecting the parts to produce the slow feed. By moving the lever (35 into the neutral position shown in Fig. 2, the clutch faces 42 and 57 will both be disengaged from their cooperating cluteh faces on the gears 39 and 56, causing the feed sprocket to remain idle.

For the purpose of su plementing the action of the sprin 36 when it is desired to more heavily loa the friction, i. e. when it. is desired to force the members into tighter engagement with the inner periphery o the member 32, and also for the purpose of preventing thespring 36 from forcing these parts into engagement when this is desirable, the following mechanism is provided.

Sli

llt]

. grip 78 and at.

RotatahlyY inonned on the ,ilutih operatingP member 35, is a trnnnxon ruig Vn 'o f operating with thtI hil'uri-atf-d rml otA a level' ate its ends the lever titi is provided with a slot whirhV rer-rives an rrrentrir pin tl on the end ot' a shaft T2 -iournaled in thit trame work and provided at its opposite end willi :i hevehd gear Ti iueshlno' with :t gral* segr' nient T4 Iixrd to the huh i5 ot' a routrolliug nwiuher or lever TG. said huh being;I snitahly jonrnalwl in thel framework. With the le vers (lo und Tti in the neutral or normal position shown in lt`igs. 2. 2i. and 4. the friction is loaded oni)y hy the Spring;r 3G exertingr its normal pressure, determined by the adjustnient ot' the nut 3T.` upon the member 35. lVhen the lever T6 is in the position shown in Fig. i. the lever (38 is ransed to press downwardl \Y upon the ring (3T. thereby soppletnent ing the action of the spring 3G. and causing the shoes 33 to engage the clutch Surtaee on the member 32 with an inrreaeed pressure. When the lever 76 is moved into the position shown in Fig. 5, the lever' is eauSed to lift upwardly on the ring 6T, there'by overroming the tension of the spring` 3U, rendering the friofion device inoperative to transmity power from the Sha-ft 28 to the eluteh member and pinion 38,` causing the feed sproeket to-rrmaln idle, and Suspend ing the operation of the feeding'meehanisin. ]t will now he observed that; the Spring 3G and the lever GS and its associated parts hoth eooperate with the member 35 and to` gethor go to make up friction loading mei-hanism which is adapted to completely nnload, to lightly load, and to heavily load the friction. It will also be not/ed that by adjustment 'of the member 37 the light loading limit` may be varied, `While oy adjustnient` either of the member (if) or ot the mein ber Si the maximum loading;r limit ma),Y he changed.

Ii voted intermediate its length to the outer en'd of the lever 76, is a, lever or handle. 77 having` aty its outer end a suitable handle 1 its opposite end a projection 79 preferably provided with a roller. The projection or roller 79 cooperates with a slot. titl in a keeper or bracket 81 preferabliv adjustahly secured t'o the framework hv means ot screws SQ passing through un elongated opening or Slot in said bracket. The levers 'tl and 7T together with the slotted' member Si mekzvup a toggle mechanism for operati hmr the controlling member or lever 7 G, providing an increased leverage whereby said last mentioned lever may be operated to apt ply the desired force or pressure to the trieL tion device by a minimum of physical eitort on the part` of the operator. tVhen the lever 7T is turned ehoutY its pivot in u countercioekwise direction from the Vnormal or noutra-l position shown in Fig. 3 into the position shown in Fig. l. the projeetion TQ. ohh-h engages tht` fixed abutment furnished h v the Wall of the slot ttt), exerts a ean or wedgjing :lotion upon the lever TT. moving: the hitter hodilv and earnyin f lr with it the lever itl. thelehv fore'in r the lutter level' into its t'rieiion loaelinpv position. rl`he slot titl is prelerahly disposed- Vsuhstantialliy perpeil'lirnlar tothe lenfg'l h ot' the ievei' TT when the hitter is in tlul position shown in Fig. l. so that the thrust oly said lever is normal to the abutment formed h v the sidiof said slot. this art ion serving to retain' the parts in :uljusted punition. lia desired. the leveril may he turned in a.eonnterelorkivise diree` tion slightly bevond the position shown in Fig. t. r-ansiugthe projection Ttllohe t'orred. by the react ion ot the spring' iti transmitted through the lever 76. against the outer end ot' the slot Htl. wherehy VSuid reartion serves more' eernrely to retain the parts in the friction loading position. j

liy turningthe lever TT in a rloekivise direction. trom the position shown in Fig. 3 into that shown in Fig. 5. ahonl the axis of the projection T5), the lever Tt is moved in the opposite dirertion from its neutral po- Sition. rausingl he friet ion drvire tolte wholly unloaded and so rendered inoperative as above explained. The uiownient ofthe parts in the manner last desrrihe-d is pret'erahly limited h v a tixe-d stop .sil projet-ting from the framework and e! v. und hlv the lover TG lhrn the i'eed mout-lling lewr tlf is; in the slow leed position .shonn in Fig'. il, the end of said lever. h v engagement with the lever Tt. loe-ks the latter lever against moreA ment in the direttion to load the t'rirtion. Said lever itl is lot-mrd with :i lug or proieetion tti uhifh. uhhh thil lever tif: is in the sion' tred potion. engages .said lever (l5 and lorks the same in .said position until the eontrolling member or lever Tt' is moved into the position shown in Fig. l, therelrv making it impossible to vhzuige the feeding speed without tirst eomplelelv releasing t the t'rietion.

The eolnplete operation may he ln'ietly reA viewed as follows: A5 Shown in Fig. ht'he meelninism is adjusted to provide a slow feed' "iith a relatively light load on the friction. ln this position the lever G5 'is looked against movement hy the lng 84. while thtl lever Tt' is held against. movement in the dii'ertion to further load the frietion by said lever (S5, H v operatingV the handle T8 to turn tho lever TT into the position shown in Fig. the friction is rendered in operative and the lever released. permitting: the same to he turned in a eounterseloek Wise clireelion. The lever ('35 may thereupon be turned into the neutral position shown in Fig. f2. which is the position t0 Ysuspend op eration of the feeding mechanism. fThe reluf) llt)

action of the spring 36 causes the levers 76 and 77 to be returned to their normal posi tron, as shown in Fig. 2, when the handle F8 is released. Further movement of the lever from the neutral position shown in Fig. 2 to thc position shown in Fig. l causes the mechanism to be adjusted for the fast feed. Thereafter the lever 77 may he moved into the position shown in Fig. l, thereby loading the friction to the maximum degree, said lever being automatically re tained in this position until intentionally re leased therefrom. It will be observed that the feedin movement of the machine can be arrester or suspended at any time. either by the movement of the lever 65 into the neutral position shown in Fig, 2` or by more' ment of the lever 77 into the friction releas ing position shown in Fig. 5, according to convenience.

It will also be noted that in my improved construction movement of the parts to apply the maximum load to the clutch is facilitated and that the parts are automatically held in the desired position and more pauw ticularly in maximum loading position in such manner as despite the vibi'ation of the machine to free the operator for other work. It will also be observed that thc slot SU in the keeper 81 serves to control and limit thc. movement of the lever 77. and consequently of the lever 76. thereby limiting the extent to which the friction device may be loadeih and preventing injurious or dangerous overloading of the same, as is possible in man chinos inwhich the load imposed upon the Friction is determined solely by the muscular effort exerted by the runner. Attention is also directed to the fact that my improved construction .is also adapted to vuse in connection with interlocking connections and more particularly interlocking control levers between the friction mechanism and thc variable speed mechanism, my improved construction being adapted to be applied to the friction lever of such a mechanism without in any way interfering with the interlocking function and when so applied operating to hold those connections or levers in interlocked relation or release thesarne therefrom. Here it will he noted that I do not claim broadly the interlocking of the friction and speed controlling levers, this being claimed in my copending application. Ren.` Ser. No. 555.916. filed Apr. 21, 1922. It will be observed that my improved mechanism includes means for automaticall maintaining ditferent loading limits for the clntclrwhen'the different trains of gearing are in operation. Observing Fig. 3, it will be seen that when the slow speed train is in operation the loadin limit for the clutch is the pressure whic is exerted upon the member 35 by the spring 36. When t ie parts are in the position of Fig. l, the loading limit is the pressure exerted at that time by the spring 36 and by the levers 76, 68 and related parts. In both cases, whether the fast train or the slow train is in use there is a definite loading limit. for the clutch and by this term I mean that the load which is imposed upon the clutch to force its component clutch elements into engagement is definitely limited. lt will therefore be un dcrstood that where I refer in the claims to a loading limit for the clutch l mean a limit to the pressure or force which may act to force the parts of the clutch into engagement with cach other.

lVhile 1 have in this applications ecitically described one embodiment, whic my invention maylassume in practice, it will be understood that this form ot the same is used for purposes-of illustration, and that the invention maybe modified and embodied in various other forms without departing from its spirit orttlie scope of the appended claims.

what l claim as new and desire to secure l v Letters Patent is:

l. The combination with a mining machine. of feeding means therefor including a yielding mechanism, a controlling memhcr for said mechanism opcrati\cly connectcd thereto, and means including a graspinv handle for said controlling .ncmber carried thereby and movable with said member and relative thereto for facilitating thc. loading of said mechanism by multiplying thc pressure exerted on said handle by an operator.

2. The combination with a mining ma chine, of feeding means therefor including a yielding mechanism. a controlling member for said mechanism opcrativel i connected thereto, and means including a iandle for said controlling member movable with said member and relative thereto for limiting the loading of said mechanism which can be effected by an operator.

3. The combination with a mining machine. of feeding means therefor including a yielding mechanism. a controlling member for said mechanism operatively connectcd thereto, and cam means includingr a handle for said controlling member movable with said member and relative thereto for limiting the loading of said mechanism by an operator.

4. The combination with a mining machine, of feeding means therefor including a yielding mechanism. a controlling member for said mechanism operatively` connected thereto. and cam means including a handle for mid controlling member movable with said member and relative thereto for limiting the loading of said mechanism and holding said handle in loaded position.

5. The combination with a mining machine. of feeding means therefor including a yielding,lr mechanism, a controlling memllo ` ber for :1id nieehuninm operatively conne-ted thereto. und nxenns ini-hiding :in opurnting handle for said eontrolling member nim'- able with Suid member und relatively thereto for sneeesaively nnlonding und limiting the loading of gziid yieldin;Y nieilnlnimn by nn i Operator. E 6.,"hc Combination with n minin`r nln- ('liine. of feeding menne: tiwrel'nr ini-hiding lo :i yielding meelmnirm. :i ennlrolling moinglier for Suid nieelnlnism operatively eonneel- Aed tlroreto. und mennor inelnding :l bundle lpixoled lo said eontrnllintgl member :ind n eooperating inenibel' engngeable by Suid lime @g5 :lle for Sile es i\ely t'niilvilnfing und limiting tho loading of Said ineehnnisnl by on `operator.

i'. The ("ombinntion with n mining nm ehine of feedingv means therefor inelnding g3g* an yielding lnecbzinisnl` n eontrolling inem' ber for Suid nleelianism operativelyv ,connerieili thereto, and controlling mean: for said aneinbir ineludinLr a linndlopivoled to said Controlling member and herringr n com enoi gagging portion on the opposite Side of its pL-rot from Said handle. und a eoopernting: anni member engngenblo by said pori ion. i S. The eonibinntion with a miningr nuleliine. of feeding' menus therefor iii-hidingr UE! a lvieldiingr inerflmnisni. :i eontrolling memY bei' for Said melfbnnisin operatively eonneete thereto. und eontroling means for said member ineinding n handle pirnted lo Said Controlling: member and haring: :i enni enon gagin'g portion on the opposite side of itsl pivot from smid handle, and nienns forining :l ennilot' in whieb Smid portion moros.

,9. The eonlbinziiion Willi :i miningr niaY rfbine. of Vl'eedini menne lnirei'nr inellnling:4 i il Yii'ldilig-lneelmniwn` :i [ontrolling niemliel For wid ineellzxnirin igwintivel'r vnnneeted ilier'elo. :and rnnlrcdliiw inenm for nid member' inilnduag :i lnindlix giiwited to smid enntrnlling member :ind boring' z: enni en i inging portion on the opiositf' Lside of ita` pivot from Snid bundle. :ind ini-:ins forming u am slot in whif-h :mid 'portion moves. said last inentionml means being: :nlinstnl'ile in n dii-elution transverse to Said pivot. 65 lll. ln `:i mining moi-bine. feeding merlin-- nim including;F :i 'frietion nlerlmnlsin. :i vontrollingz member for will nieenrininni onerntively ronnerted (hereto. :md eoopei'ntingf un menno inelndlng :in operiting hando iiyrivntod on mid l'i'ii-Iion eontrolingj meniliei For inerensing the ronge of possible) #noveno-Anl` of Anid inoniber by nn operator :und holding it 'in nmxinmin loaded position. M "ll, ln :i mining mnflline, lewlinrgir inc-elim lil'nisln inellnlinff :i i'rielion inei-lmniflin. n emr vtrolling member for mid meelmnifinl operyntively Vonne-tell llmi'elo5 sind eoopernlingf coin n'fmxns inf'lnlin; lr :i log-gie eonneeted opnGrafing lmndle pivoted on Said friction roniltrolling member for increuning the range of possible movement of said momner by an onelrzitor and holding it in maximum loaded position.

ln n mining mneliine, feeding mechanism includin r n friction merliimism, a controlling mem )er [or sind mechanism operatively eonneeted thereto, and cooperating emn xnenns inelnding im operating handle piroted on said friction controlling meinlwr for inereasing: the ronge of pogo-ibi@ more-nient ot' Said member by :in operator and holding' it in maximum loaded position, n portion ot' said ezim means bein; adjustable.

lfl. The eoinbinntion with a mining muehine. oil feeding: menno therefor including n variable speed nieelinninm :rnd n 1Vielding nier'lmnisln, interloeliing erers for said rneelmnmns operatively eonneeted thereto :ind operative in one position to prevent nmnnail loading of saliti yielding meehnnism, und means for positirely limiting; the loading of mid yielding meebnnism when said levers :1re disengaged `inelnding supplemenlzil pivoted ievor ineelizinisln.

14. The r'ombinnlion with :i mining mav eliine. nt' Feedin;y nii-:lm therefor inelndinr;r 21 rnl'inble speed meri-mism :1nd :l *y'ieldii'r;r meelmnism` interior-king levers for said meehnnismq opei'ntiveiy eonnetted thereto and operativo in one posilion lo prevent, manna! loading of mid vieldin; y meelmniem and :nonno for {':ieiiitninir :ind positively limitin;r the loading oi'- rmid yielding meehanism when Said levers are disengaged innl inling snmilomentnl pivoted lever ineelni` msm.

l5. The eon'al'iinaion with n mining ninf'liine. of feedingr menno tllorelor inelndin;r n variable speed naerlninism :ind :i )fielding merlinnisnn interloekinif eontrollingf mein bero for Said nier'ha'ininis operzitirelv ennY nei-ted thereto operative in one poSiiinn to prevent nmnlml loading of Suid Yyielding nleeimnisjm. :1nd means irwlndingr an operaiing bnndlo for :mel enrriod by one of said members; for lpordtively limiting "the loading of said yieldingmeelmnism when said members :ire disengaged.

lll, The combination with n Ininlg maehine, of feeding menos therefor including n variable, speed meflmnism and if yielding' meehunism., inerlooking controlling members for said merlinnisnns.Y and menno in* vinding n toggle ronneeted operating handle for one of said members for facilitating the imiding of Suid yielding mechanism wlion ,Quid members are unlocked.

li', The. eombinzition with a mining mib rhino` of feeding means therefor inelniiing' ii variable spoed meehanism and a yielding;lr mechanism. interloeking eontrollingg` mein- `bei-. 4 'l'or Suid meelnmisms, und means including a. pivoted handle on one of said members for successively facilitating and limitin the loading of said yielding mechanism w en said members are unlocked.

18. In a mining machine` the combination with feeding mechanism including a yielding element, of means for supplementing the normal resistance to yielding opposed by said element, and means tor rendering said first named means operative or inoperative, said last named means including an angularly and bodily movable lever and means engaged by said lever for holding the same against bodily movement when in an angular position corresponding to the operative position of said first named means.

19. In a mining machine. the combination with feeding mechanism including a yielding element, of means for supplementing the normal resistance to yielding opposed by said element, and means for rendering said first named means operative or inoperative, Said last named means including an angularly and bodily movable lever and an abutment having a face engaged by said lever, said face being substantially perpendicular to the length of said lever when the latter is in an angular position corresponding to the operative position of said first named means.

20. In a mining machine, the combination with feeding mechanism including a yielding element, of means for supplementing the normal resistance to yielding opposed by said element, and means for rendering said first named means operative or inoperative, said last named means including an angularly and bodily movable lever. a keeper having a slot. and means on said lever engaging said slot for controlling the movements of said lever.

21. In a mining machine. the combination with feeding mechanism including a yieldingr element, of means for increasing the resistance to yielding opposed by said element, and means For rendering said first named means operative or inoperative., said last named means including an angnlarly and bodily movable lever` an adjustable abutment, and means on said lever engaging said abutment for controlling the movements of said lever.

22. In a mining machine, the combination with feeding mechanism including a yielding element, of means for increasing the resistance to yielding opposed `by said element. and means for rendering said first` named means operative or inoperative` said last named means including an angularly and bodily movable lever, an adjustable bracket having a slot, and a projection on said lever engaging said slot for controlling the movements lof said lever.

y23. In a mining machine.v the combination with feeding mechanism including a yielding element, of means for increasing the resistance to yielding opposed by said element, a lever for operating said means, a

ment engaged by said second lever, saidv abutment having a face disposed substantially perpendicular to the length of said second lever when the latter is in a position to cause operation of said resistance increasing means.

25. In a mining machine, the combination with feeding mechanism including a yielding element, of means for increasing the resistance to yielding opposed by said element` a lever for operating said means, a. second lever pivoted to said first named lever for actuating the same, an adjustable bracket having a slot, said slot being disposed substantially perpendicular to the length of said second lever when the latter is in a position to cause operation of said resistance increasing means, and a projection on said second lever engaging said slot for controlling the movements of said lever.

2G. Ima mining machine, the combination with feeding mechanism including a yielding element, of means for increasing the resistance to yielding opposed by said element. and toggle mechanismf for operating said resistance increasing means.

27. In a mining machine, the combination with feeding mechanism including a yielding element, of means 'for supplementing -the normal resistance to yielding opposed by said element. and toggle mechanism for operating said last named means, said mechanism having provision for retaining the saule in operatlve position.

28. In a mining machinc, the combination with feeding mechanism including a yielding element, ofiucans for increasing the rcsistance to yielding opposed by said element, and means for operating sail resistance increasing means including a lever operatively connected therewith, a hand lever pivoted to said first named lever for actuating the` same, and a fixed abutment engaged by said hand lever.

29. In a mining machine, the combination with feeding mechanism including a yielding element, of means for increasing the resistance to yielding opposed by said element. and means for operating said resistance increasing means including a lever operatively connected therewith, a second lever pivoted intermediate its ends to said first named lever, a fixed abutment, and means carried by one end of said second lever for engaging said abutment. I 'i 30. 'In a mining inavhinv, "lw ijginiliinuinn with feeding', mechanism including; al Yielding element,4 nf'vinL-nn's fut imi-mining the rcsistnnv lo yielding npposqd ljyziid elcmunt.

.wand menus for rendm'ingfy aid Fnsi' inlined' usi said hand lever and engaging the' slot in said keeper for controlling the 'movement of said hand lever.

43. In a mining machine,-the combination with feeding mechanism including a yielding element, of means for supplementing the normal resistance to yielding oppose by said element or for rendering said element inoperative to transmit power, an operating lever for controlling said last named means, a hand lever pivoted intermediate its ends to said operating lever, a fixed keeper having a slot, and means on the end of said hand lever and engaging said slot for controlling the movements of said h and lever.

44. In a mining machine, the combination with feeding mechanism having provision for relatively fast and slow feeding speeds and including a yielding element, of means for increasing the resistance to yielding opposed by said element, toggle mechanism for operating said resistance increasn means, and means for controlling` the fee mg speed and .for holding said toggle mechanlsm against operation to increase Said resistance.

45. In a mining machine, the combination with feeding mechanism having provision for fast and slow speeds and including a yielding element, of interlocking controlling members operatively connecte to, said mechanisms for controlling the speed di said feeding mechanism and the resistance to yielding of said yielding element, and cooperating controlling means includinga cam member pivoted on one of said members and forming the operating handle therefor.

y 46. In a mining machine, the combination with feeding mechanism having provision for fast and slow speeds and mcludin a yielding element, of interlocking controllln members operatively connected to sai mechanisms for controlling the speed of said feeding mechanism and the resistance to yielding 0f said yielding element, and c0- operating controlling means including a cam member pivoted at a point between its ends to one of Said members and forming the operating handle therefor.

47. In a mining machine, the combination with feeding mechanism having provision for fast and Slow speeds and including a yielding element', of interlocking controlling members operatively connected to said mechanisms for controlling the speed of said feeding mechanism and the .resistance to yielding of said yielding element, and c0- operating controlling means including a cam member pivoted on the controlling member for s'aid yielding element and forming the operating handle therefor.

48. In a mining machine, the combination with feeding mechanism having provision for fast and slow speeds and includinga yielding element, of interlocking controlling members operatively connected to said mechanisms for controlling the speed of said feeding mechanism and the resista-nce to yielding of said yielding element, and cooperating controlling lmeans including a cam member pivotedat a point between its ends on the controlling member for said yielding element and forming the operating handle therefor.

49. In a mining machine, the combination with feeding mechanism having provision for f `t and slow speeds and including a yieldielement, of interlocking controllin f membe s o 'eratively connected to sai mechanism or controlling the speed of said feeding mechanism and the resistance to yielding of said yielding element, and cooperating ,cam means including a fixed element and a cooperating movable element pivoted to the controlling member for said yielding element and forming the operating handle therefor.

n testimony whereof I s fix my signature.

MORlTV1 iS P. HOLMES. 

